This i09 post, which was cross-posted to Foxtrot Alpha, reminded me of a Discovery or History Channel show I'd watched about large explosions.

One of the featured incidents was the 1988 Pepcon disaster outside of Henderson, NV where a fire involving ammonium perchlorate (used in solid rocket fuel) caused a series of massive explosions and killed two people.

That led me to a fire at a Dallas, TX welding company in which canisters of acetylene started going off like bottle rockets.

Finally, I was reminded of a derailed tanker car full of propane in Murdock, IL, that exploded and sent the car flying more than 3,600 feet.